My mind had formed a mental prison
I cried aloud no-one would listen
Then floating through the heavy mist
My vision took a sudden twist

Empty people stood in grey
Children laughing far away
An empty courtyard wept alone
Rain lashed down on darkened stone

A crystal glove points to the door
A threshold I had crossed before
On turning back all I could see
Were her footprints on the sea.[ Lyrics from: http://www.lyricsty.com/porcupine-tree-footprints-lyrics.html ]